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Computer Vision and Pattern Recognition, 1994. Proceedings CVPR '94., 1994 IEEE Computer Society Conference on

Date 21-23 June 1994

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Displaying Results 1 - 25 of 166
  • Proceedings of IEEE Conference on Computer Vision and Pattern Recognition

    Publication Year: 1994
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    Freely Available from IEEE
  • Recognizing object function through reasoning about 3-D shape and dynamic physical properties

    Publication Year: 1994, Page(s):546 - 553
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    Recent work in computer vision has demonstrated positive results in reasoning about possible object function based on analysis of only the object shape. While shape properties are important, verification of actual functionality generally requires consideration of properties beyond pure static shape. In particular, dynamic physical properties such as the degree of deformation or rigidity under appl... View full abstract»

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  • Realistic range rendering

    Publication Year: 1994, Page(s):848 - 851
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    In many model-based object recognition systems, a synthesize-and-verify technique is used to evaluate the quality of hypotheses. This technique synthesises images of hypothesized objects in hypothesized poses, and compares them against the input imagery, producing a matching score. In this paper, we examine the image synthesis process in the context of triangulation-based range finding. We motivat... View full abstract»

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  • Qualitative tracking of 3-D objects using active contour networks

    Publication Year: 1994, Page(s):812 - 817
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    In this paper, we track changes in the appearance of the object as it moves from one frame to the next. At a symbolic level, an aspect graph clusters all the views of an object into a set of topologically distinct classes in terms of which surfaces of an object are visible from a given viewpoint (Koenderink and van Doom (1979). Two nodes (or aspects) in the aspect graph are connected by an arc if ... View full abstract»

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  • The development of the Image Understanding Environment

    Publication Year: 1994, Page(s):443 - 447
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    The Image Understanding Environment (IUE) project is a five year program, sponsored by ARPA, to develop a common object-oriented software environment for the development of algorithms and application systems. This paper reviews the design of this system and provides an overview of the distributed implementation effort currently underway at Amerinex AI, Advanced Decision Systems, Carnegie Mellon Un... View full abstract»

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  • A low-dimensional representation of human faces for arbitrary lighting conditions

    Publication Year: 1994, Page(s):995 - 999
    Cited by:  Papers (103)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    When recognizing a fixed object from a fixed viewpoint, the dominant source of variation in image intensity is lighting changes. We propose a low-dimensional model for human faces that can both synthesize a face image when given lighting conditions and can estimate lighting conditions when given a face image. The model can handle non-Lambertian and self-shadowing surfaces such as faces because it ... View full abstract»

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  • Good features to track

    Publication Year: 1994, Page(s):593 - 600
    Cited by:  Papers (1215)  |  Patents (98)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    No feature-based vision system can work unless good features can be identified and tracked from frame to frame. Although tracking itself is by and large a solved problem, selecting features that can be tracked well and correspond to physical points in the world is still hard. We propose a feature selection criterion that is optimal by construction because it is based on how the tracker works, and ... View full abstract»

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  • Occluding contour detection using affine invariants and purposive viewpoint control

    Publication Year: 1994, Page(s):323 - 330
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (732 KB)

    We present an approach for identifying the occluding contour and determining its sidedness using an active (i.e., moving) observer. It is based on the non-stationarity property of the visible rim: When the observer's viewpoint is changed, the visible rim is a collection of curves that “slide,” rigidly or non-rigidly over the surface. We show that the absenter can deterministically choo... View full abstract»

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  • Independent motion segmentation and collision prediction for road vehicles

    Publication Year: 1994, Page(s):958 - 961
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    This paper presents a method for doing motion segmentation for autonomous vehicles which drive on planar surfaces. There are two distinct types of independent motion that may occur within an image sequence taken from a moving vehicle. The first generic type of independent motion is when the projected motion of points on the independent object violate the epipolar constraint. The second case is whe... View full abstract»

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  • Viewpoint selection for visual search

    Publication Year: 1994, Page(s):800 - 805
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    Searching for an object in a cluttered area is often complicated by the fact that the clutter hides portions of the area from view. Multiple viewpoints are often required. Previous viewpoint selection algorithms rely on models that represent the portions already viewed. Unfortunately, these models are often difficult to construct when the sensor position is imprecisely known and when the obtainabl... View full abstract»

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  • Scene understanding from propagation and consistency of polarization-based constraints

    Publication Year: 1994, Page(s):1000 - 1005
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (644 KB)

    We show how the more general capabilities of polarization vision can be used to significantly enhance the understanding of imaged scenes particularly at regions containing specular and mirror reflections, and occluding contours. Intensity-based methods are easily confounded by specular reflection. Specular mirror reflection of an object is indistinguishable from the object itself when using intens... View full abstract»

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  • Extremal points: definition and application to 3D image registration

    Publication Year: 1994, Page(s):587 - 592
    Cited by:  Papers (15)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    This paper presents the extraction of feature points, geometrically invariant, which can be used as reliable landmarks for registration and recognition. Mainly we show that it is possible to extract automatically feature lines and points from 3D images, which are robust and invariant with respect to rigid transforms, and enough precise to perform the automatic registration. This extends the possib... View full abstract»

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  • HOT curves for modelling and recognition of smooth curved 3D objects

    Publication Year: 1994, Page(s):876 - 880
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Arbitrary smooth curved 3D shapes are represented by a discrete set of high-order tangent (HOT) curves, where a surface admits HOTs. These curves determine the structure of the image contours and its catastrophic changes, and there is a natural correspondence between some of them and monocular contour features such as inflections and bitangents. We present a method for automatically constructing t... View full abstract»

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  • A study relating image sampling rate and image pattern recognition

    Publication Year: 1994, Page(s):709 - 712
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    The trade-off between the granularity of the data representation and the recognition accuracy is examined in this paper. We show that unless a particular criterion is satisfied, there is no guarantee of achieving a prescribed recognition accuracy. This criterion of interest, is the mutual information content between the measurements and the class identities. A novel method for the objective evalua... View full abstract»

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  • MDL-based spatiotemporal segmentation from motion in a long image sequence

    Publication Year: 1994, Page(s):448 - 453
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    This paper presents a method for spatiotemporal segmentation of long sequences of images which include multiple independently moving objects, based on the Minimum Description Length (MDL) principle. Spatiotemporal (ST) segments in the image sequence are extracted, each of which consists of edge segments having similar motions. First, we construct a family of motion models, each of which is complet... View full abstract»

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  • Projective reconstruction from line correspondences

    Publication Year: 1994, Page(s):903 - 907
    Cited by:  Papers (22)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The paper gives a practical rapid algorithm for doing projective reconstruction of a scene consisting of a set of lines seen in three or more images with uncalibrated cameras. The algorithm is evaluated on real and ideal data to determine its performance in the presence of varying degrees of noise. By carefully consideration of sources of error, it is possible to get accurate reconstruction with r... View full abstract»

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  • Simultaneous segmentation and approximation of complex patterns

    Publication Year: 1994, Page(s):617 - 623
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (692 KB)

    Deformable model have been widely used to approximate objects from collected data points, but most algorithms based on the deformable model can only handle geometrically and topologically simple objects. They are inadequate for objects with deep cavities or multi-part objects. Furthermore, they always assume there is only one underlying object for the collected data, which means the segmentation h... View full abstract»

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  • On integration of vision modules

    Publication Year: 1994, Page(s):316 - 322
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    Individual cues from visual modules are fallible and often ambiguous. As a result, only integrated vision systems can be expected to give a reliable performance in practice. The design of such systems is challenging since each vision module works under different and possibly conflicting sets of assumptions. We have proposed and implemented a multiresolution system which integrates perceptual group... View full abstract»

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  • Singularity analysis and derivative scale-space

    Publication Year: 1994, Page(s):245 - 250
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    The scale-space representations and wavelet transform theory have provided us with good singularity detection frameworks. Thanks to such methods, image understanding processes have become more and more powerful. Some computer vision tasks also require a knowledge on the nature of detected singularities. We propose, in this paper, to take into account these requirements, and we present a singularit... View full abstract»

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  • The extruded generalized cylinder: a deformable model for object recovery

    Publication Year: 1994, Page(s):174 - 181
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    There is increasing interest in the recovery of generalized cylinders (GCs) with curved spines. However, existing formulations of such GCs, for example those based an the Frenet-Serret frame or the tube model, suffer serious drawbacks: discontinuities, a lack of expressive power, ”narrowing” in the plane normal to the spine, non-intuitive twisting behavior, and/or off-axis nonorthogona... View full abstract»

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  • Motion and structure from one dimensional optical flow

    Publication Year: 1994, Page(s):962 - 965
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    This paper is based on the observation that if the viewing camera is appropriately mounted on a vehicle which moves on a planar surface, the problem of motion and structure recovery from optical flow becomes linear and, in principle, can be solved locally. It is shown that angular velocity and depth can be computed from one component only of the optical flow, and that the accuracy in the estimatio... View full abstract»

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  • VISIPLAN: a hierarchical planning framework for composing biomedical image analysis processes

    Publication Year: 1994, Page(s):718 - 723
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    This paper presents a new knowledge-based approach to the composition of biomedical image analysis processes. A prototype system has been developed that provides the imaging domain expert with the tools needed to formulate, specify and experiment with the design of analysis strategies. The system has been tested in the area of MR image analysis with promising results View full abstract»

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  • Subpixel contour matching using continuous dynamic programming

    Publication Year: 1994, Page(s):202 - 207
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    This paper presents a subpixel contour matching algorithm using a novel dynamic programming scheme. Unlike classical dynamic programming methods, where a discrete path is searched for across a graph, our approach allows the optimal continuous path to be determined. The matching is obtained as a piecewise parametric function, and no discretization is involved, nor any parameterized deformation assu... View full abstract»

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  • Principal component analysis with missing data and its application to object modeling

    Publication Year: 1994, Page(s):560 - 565
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    Observation-based modeling can reduce the cost and effort of model constructions for tasks such as virtual reality environment. Object modeling from a sequence of range images has been formulated as a problem of principal component analysis with missing data (PCAMD), which can be generalized as a weighted least square (WLS) minimization problem. After all visible regions appeared over the whole se... View full abstract»

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  • Controlled active exploration of uncalibrated environments

    Publication Year: 1994, Page(s):792 - 795
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    Flexible operation of a robotic agent in an uncalibrated environment requires the ability to recover unknown or partially known parameters of the workspace through sensing. Of the sensors available to a robotic agent, visual sensors provide information that is richer and more complete than other sensors. In this paper we present robust techniques for the derivation of depth from feature points on ... View full abstract»

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